Immagino che ho postato troppo poco per farmi aiutare, riprovo.


codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<HTML>
<HEAD>

	<script type="text/javascript" src="../js/ajax.js"></script>
	<script type="text/javascript">
	var DHTML_SUITE_THEME = 'light-cyan';	</script>
	<script type="text/javascript" src="../js/dhtml-suite-for-applications.js"></script>
</head>
<body>


<div id="northContent">
North div
</div>

<div id="westContent">
West div
</div>


<div id="center">
Center div
</div>

<div id="center3">
Queste sono le funzioni che vorrei aggiungere quando premo uno dei tab CENTER


Hide west pane
Show west pane 
</div>


<div id="eastContent">
east div
</div>

<div id="southContent">
south div
</div>


<script type="text/javascript">

/* STEP 1 */
/* Create the data model for the panes */
var paneModel = new DHTMLSuite.paneSplitterModel( { collapseButtonsInTitleBars:true } );
DHTMLSuite.commonObj.setCssCacheStatus(false)
var paneWest = new DHTMLSuite.paneSplitterPaneModel( { position : "west", id:"westPane",size:200,minSize:100,maxSize:300,scrollbars:true,callbackOnCollapse:'callbackFunction',callbackOnExpand:'callbackFunction',callbackOnShow:'callbackFunction',callbackOnHide:'callbackFunction',callbackOnSlideIn:'callbackFunction',callbackOnSlideOut:'callbackFunction',callbackOnResize:'callBackFunctionResizePane' } );
paneWest.addContent( new DHTMLSuite.paneSplitterContentModel( { id:"westContent",htmlElementId:'westContent',title:'West',tabTitle:'West pane' } ) );

var paneEast = new DHTMLSuite.paneSplitterPaneModel( { position : "east", id:"eastPane",size:150,minSize:100,maxSize:200,callbackOnCollapse:'callbackFunction',callbackOnCloseContent:'callbackFunction',callbackOnBeforeCloseContent:'validateCloseContent' } );
paneEast.addContent( new DHTMLSuite.paneSplitterContentModel( { id:"eastContent",htmlElementId:'eastContent',title:'East',tabTitle: 'Tab 1' } ) );


var paneSouth = new DHTMLSuite.paneSplitterPaneModel( { position : "south", id:"southPane",size:60,minSize:50,maxSize:130,resizable:true,callbackOnCollapse:'callbackFunction' } );
paneSouth.addContent( new DHTMLSuite.paneSplitterContentModel( { id:"southContent",htmlElementId:'southContent',title:'South pane' } ) );

var paneNorth = new DHTMLSuite.paneSplitterPaneModel( { position : "north", id:"northPane",size:65,scrollbars:false,resizable:false } );
paneNorth.addContent( new DHTMLSuite.paneSplitterContentModel( { id:"northContent",htmlElementId:'northContent',title:'' } ) );

var paneCenter = new DHTMLSuite.paneSplitterPaneModel( { position : "center", id:"centerPane",size:150,minSize:100,maxSize:200,callbackOnCloseContent:'callbackFunction',callbackOnTabSwitch:'callbackFunction' } );
paneCenter.addContent( new DHTMLSuite.paneSplitterContentModel( { id: 'center',htmlElementId:'center',title:'DHTML Suite for application',tabTitle: 'Welcome',closable:false } ) );
paneCenter.addContent( new DHTMLSuite.paneSplitterContentModel( { id:'center3', htmlElementId:'center3',title:'Pane splitter methods',
tabTitle: 'Prova'   
 } ) );


paneModel.addPane(paneSouth);
paneModel.addPane(paneEast);
paneModel.addPane(paneNorth);
paneModel.addPane(paneWest);
paneModel.addPane(paneCenter);



var paneSplitter = new DHTMLSuite.paneSplitter();
paneSplitter.addModel(paneModel);	// Add the data model to the pane splitter
paneSplitter.init();	// Add the data model to the pane splitter

function callbackFunction(modelObj,action,contentObj)
{
	self.status = 'Event "' + action + '" triggered for pane with id "' + modelObj.id + (contentObj?'" - content id: ' + contentObj.id:'');
}

function callBackFunctionResizePane(modelObj,action,contentObj)
{
	var size = paneSplitter.getSizeOfPaneInPixels(modelObj.getPosition());
	self.status = 'Pane ' + modelObj.getPosition() + ' has been resized to ' + size.width + ' x ' + size.height + ' pixels';
}
</script>
</body>
</html>

In pratica se copiate il codice in una pagina vedete che vorrei fare in modo che quando premo il secondo tab centrale esegua la funzione collapse.

Qualche consiglio?
Ciao